A Tuned Mass Damper with Nonlinear Magnetic Force for Vibration Suppression with Wide Frequency Range of Offshore Platform under Earthquake Loads

Table 2

Results of the evaluation indices.

Seismic excitation	Displacement response		Acceleration response
	El-Centro NS	0.196	0.790	0.399	0.795
Taft EW	0.397	0.807	0.542	0.941
Fukushima NS	0.235	0.815	0.380	0.776